The blessings for obedience and curses for disobedience in the Law were tied to earthly pictures of divine justice on the Last Day and not intended to teach us what each of us should expect day to day in our lives.

Because the Law was a picture of what it looks like to be rewarded for obedience and cursed for disobedience on a small and controlled scale (in order to teach man that this is not what he wants for his salvation) it, necessarily, had to have rewards and curses.